body{
    margin: 0;
    padding: 0;
}
.box{
    width: 100%;
    height: 100vh;
    background: #000;;
    margin: auto;
}
.buu{
    width: 99vw;
    height: 100px;
    position: absolute;
    bottom: 10px;
}
.buu>button{

    width: 22vw;
    height: 6vh;
    font-weight: bolder;
    font-size: 55px;
    cursor: pointer;
    margin-left: 2vw;
    /*border: 0;*/
}
.bu2{
    background: red;
    color: #ffffff;
}
.bu3{
    background: blue;
    color: #ffffff;
}
.bu4{
    background: #000;
    color: #ffffff;
}
.bu5{
    background: green;
    color: #ffffff;
}